Employee Benefit Plans (Before-Tax Amounts not Recognized in Net Periodic Benefit Cost and Sources of Change in Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease [Abstract]
Net actuarial gain (loss) arising during the period	$ 357	$ (210)	$ (55)
Amortization of (gain) loss included in income	178	117	146
Prior service (cost) credit arising during the period	0	29	0
Amortization of prior service cost (credit) included in net loss	(38)	(32)	$ (35)
Pension Plans Defined Benefit [Member] \| U.S. [Member]
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease [Abstract]
Net actuarial gain (loss) arising during the period	134	(83)
Amortization of (gain) loss included in income	145	95
Net change during the period	(279)	(12)
Prior service (cost) credit arising during the period	0	0
Amortization of prior service cost (credit) included in net loss	0	0
Net change during the period	0	0
Pension Plans Defined Benefit [Member] \| Foreign Pension Plans, Defined Benefit [Member]
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease [Abstract]
Net actuarial gain (loss) arising during the period	207	(120)
Amortization of (gain) loss included in income	33	21
Net change during the period	(240)	99
Prior service (cost) credit arising during the period	0	(1)
Amortization of prior service cost (credit) included in net loss	(1)	(1)
Net change during the period	(1)	(2)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease [Abstract]
Net actuarial gain (loss) arising during the period	16	(7)
Amortization of (gain) loss included in income	0	1
Net change during the period	(16)	6
Prior service (cost) credit arising during the period	0	30
Amortization of prior service cost (credit) included in net loss	(37)	(31)
Net change during the period	$ (37)	$ (1)

Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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